Adding llama31 (#2404)
Summary:
Runs fine locally on CPU, pipelines will hopefully validate that
Pull Request resolved: https://github.com/pytorch/benchmark/pull/2404
Reviewed By: kit1980
Differential Revision: D60628732
Pulled By: xuzhao9
fbshipit-source-id: 7a5a313e871311f2d1c0eadcf125128ccd407743
